- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄361331 > QW050A1 Analog IC PDF資料下載
參數(shù)資料
| 型號： | QW050A1 |
| 英文描述： | Analog IC |
| 中文描述： | 模擬IC |
| 文件頁數(shù)： | 15/20頁 |
| 文件大?。?/td> | 1272K |
| 代理商： | QW050A1 |
Lucent Technologies Inc.
15
Data Sheet
May 2000
dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 50 W and 75 W
QW050A1 and QW075A1 Power Modules:
Thermal Considerations
(continued)
Heat Transfer with Heat Sinks
(continued)
Example
If an 85 °C case temperature is desired, what is the
minimum airflow necessary Assume the QW075A1
module is operating at V
I
= 54 V and an output current
of 15 A, maximum ambient air temperature of 40 °C,
and the heat sink is 1/2 inch. The module is oriented in
the transverse direction.
Solution
Given: V
I
= 54 V
I
O
= 15 A
T
A
= 40 °C
T
C
= 85 °C
Heat sink = 1/2 inch
Determine P
D
by using Figure 24:
P
D
= 16 W
Then solve the following equation:
Use Figure 26 to determine air velocity for the 1/2 inch
heat sink.
The minimum airflow necessary for the QW075A1
module is 1.2 m/s (240 ft./min.).
Note:
Pending improvement will lower the power dissi-
pation and reduce the airflow needed.
Custom Heat Sinks
A more detailed model can be used to determine the
required thermal resistance of a heat sink to provide
necessary cooling. The total module resistance can be
separated into a resistance from case-to-sink (
θ
cs) and
sink-to-ambient (
θ
sa) as shown in Figure 32.
8-1304 (C)
Figure 32. Resistance from Case-to-Sink and
Sink-to-Ambient
For a managed interface using thermal grease or foils,
a value of
θ
cs = 0.1 °C/W to 0.3 °C/W is typical. The
solution for heat sink resistance is:
(
)
P
D
This equation assumes that all dissipated power must
be shed by the heat sink. Depending on the user-
defined application environment, a more accurate
model, including heat transfer from the sides and bot-
tom of the module, can be used. This equation provides
a conservative estimate for such instances.
EMC Considerations
For assistance with designing for EMC compliance,
please refer to the FLTR100V10 data sheet
(DS99-294EPS).
Layout Considerations
Copper paths must not be routed beneath the power
module mounting inserts. For additional layout guide-
lines, refer to the FLTR100V10 data sheet
(DS99-294EPS).
θ
ca
T
------------------------
T
–
(
)
P
D
=
θ
ca
85
-----------------------
40
–
(
)
16
=
θ
ca
2.8 °C/W
=
P
D
T
C
T
S
T
A
cs
sa
θ
sa
C
-T
T
A
–
θ
cs
–
=
相關PDF資料 |
PDF描述 |
|---|---|
| QW075A1 | Analog IC |
| QW050F1 | Analog IC |
| QW075F1 | Analog IC |
| QW0905-LUR3333H | SUPER BRIGHT ROUND TYPE LED LAMPS |
| QWD1205 | Analog IC |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| QW050A81 | 功能描述:DC/DC轉換器 5V 50W OUT RoHS:否 制造商:Murata 產(chǎn)品: 輸出功率: 輸入電壓范圍:3.6 V to 5.5 V 輸入電壓（標稱）: 輸出端數(shù)量:1 輸出電壓（通道 1）:3.3 V 輸出電流（通道 1）:600 mA 輸出電壓（通道 2）: 輸出電流（通道 2）: 安裝風格:SMD/SMT 封裝 / 箱體尺寸: |
| QW050B71 | 功能描述:DC/DC轉換器 12V 4.17A 50W 8-Pin RoHS:否 制造商:Murata 產(chǎn)品: 輸出功率: 輸入電壓范圍:3.6 V to 5.5 V 輸入電壓（標稱）: 輸出端數(shù)量:1 輸出電壓（通道 1）:3.3 V 輸出電流（通道 1）:600 mA 輸出電壓（通道 2）: 輸出電流（通道 2）: 安裝風格:SMD/SMT 封裝 / 箱體尺寸: |
| QW050F1 | 功能描述:DC/DC轉換器 3.3V 10A 33W 8-Pin RoHS:否 制造商:Murata 產(chǎn)品: 輸出功率: 輸入電壓范圍:3.6 V to 5.5 V 輸入電壓（標稱）: 輸出端數(shù)量:1 輸出電壓（通道 1）:3.3 V 輸出電流（通道 1）:600 mA 輸出電壓（通道 2）: 輸出電流（通道 2）: 安裝風格:SMD/SMT 封裝 / 箱體尺寸: |
| QW051 | 制造商:NTE Electronics 功能描述:Res Metal Film 51 Ohm 2% 1/4W ±200ppm/°C Conformal AXL Thru-Hole |
| QW051-10 | 制造商:NTE Electronics 功能描述: |
發(fā)布緊急采購，3分鐘左右您將得到回復。